GB2419251A - Document camera with adjustable light source - Google Patents

Document camera with adjustable light source Download PDF

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Publication number
GB2419251A
GB2419251A GB0510242A GB0510242A GB2419251A GB 2419251 A GB2419251 A GB 2419251A GB 0510242 A GB0510242 A GB 0510242A GB 0510242 A GB0510242 A GB 0510242A GB 2419251 A GB2419251 A GB 2419251A
Authority
GB
United Kingdom
Prior art keywords
light
camera
emitting
light source
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0510242A
Other versions
GB2419251B (en
GB0510242D0 (en
Inventor
Chi-Hsien Shih
Shi-Mu Sun
Lien-Kai Chou
Rein-Wein Lin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Avermedia Technologies Inc
Original Assignee
Avermedia Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Avermedia Technologies Inc filed Critical Avermedia Technologies Inc
Publication of GB0510242D0 publication Critical patent/GB0510242D0/en
Publication of GB2419251A publication Critical patent/GB2419251A/en
Application granted granted Critical
Publication of GB2419251B publication Critical patent/GB2419251B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/40056—Circuits for driving or energising particular reading heads or original illumination means
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
    • H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
    • H04N1/195—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
    • H04N1/195—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays
    • H04N1/19594—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a two-dimensional array or a combination of two-dimensional arrays using a television camera or a still video camera
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2215/00—Special procedures for taking photographs; Apparatus therefor
    • G03B2215/05—Combinations of cameras with electronic flash units
    • G03B2215/0503—Built-in units
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/04—Scanning arrangements
    • H04N2201/0402—Arrangements not specific to a particular one of the scanning methods covered by groups H04N1/04 - H04N1/207
    • H04N2201/0436—Scanning a picture-bearing surface lying face up on a support

Landscapes

  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Studio Devices (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Exposure Control For Cameras (AREA)
  • Accessories Of Cameras (AREA)
  • Projection Apparatus (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Image Input (AREA)

Abstract

A document camera with light compensation functionality includes a camera securing to a base. The document camera has an emitting-adjustable light source. A sensor, installed on top of the camera, measures the light in the surroundings and outputs an analog signal. A converter transforms the analog signal into a digital signal. A light-computing unit receives the digital signal and produces a signal including an optimum light condition. A light controller controls the intensity of the light of the emitting-adjustable light source according to the signal including the optimum light condition outputted from the light-computing unit.

Description

241 925 1 Document Camera with Light Compensation Functionality
BACKGROUND
Field of Invention
s The present invention relates to a document camera. More particularly, the present invention relates to a document camera with light compensation functionality.
Description of Related Art
lo Traditionally, a common presentation apparatus is a projector presented through a slide. With the advancement of technologies, the useful presentation apparatus at present includes a projector with a LCD, a laptop and a document camera.
The document camera may directly present an object on a monitor without previously transforming the object, such as a document or material, into an image file or a document file. The document camera uses a digital camera to capture an image of the object and directly presents the image on a monitor. Therefore, by using the document camera, a presenter will save a lot of time without preparing the presentation data previously.
When the document camera is used, if the intensity of the light in the surroundings is too high, it will cause the image of the object presented on the monitor becomes dark so that the image will not to be identified easily. Therefore, a solution used to solve the above problems is necessary for the document camera manufactures.
SUMMARY
It is therefore an objective of the present invention to provide a document camera with light compensation functionality for obtaining an excellent effect of projection.
According to the foregoing objectives of the invention, a document camera with light compensation functionality is provided. The document camera comprises a camera securing to a base and the camera has an emittingadjustable light source. The camera measures the intensity of the light in the surroundings through a light sensor on top of the camera and outputs a to corresponding analog signal to a signal converter. The signal converter converts the analog signal into a digital signal. A light-computing unit receives the digital signal and calculates a signal including an optimum light condition for the camera according to the digital signal. A light controller controls the intensity of the light of the emitting-adjustable light source according to the signal including the optimum light condition outputted from the light-computing unit. The emitting-adjustable light source is a light source having a plurality of LEDs or an emitting-adjustable light bulb.
As described in above, according to the application of the document camera with light compensation functionality of the present invention, measures the intensity of the light in the surroundings, calculates a signal having an optimum light condition and controls the intensity of the light of the camera.
According to the application of light compensation functionality, which can prevent the effect of projection tend to unexpected when the intensity of the light in the surroundings is in a high level, such as the image of the object becomes dark and not easily to be identified, and further to enhance the effect of projection.
It is to be understood that both the foregoing general description and the following detailed description are by examples and are intended to provide further explanation of the invention as claimed.
s BRIEF DESCRIPTION OF THE DRAWINGS
These and other features, aspects, and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings where: To Fig. 1 is a schematic diagram illustrating a document camera with light compensation functionality according to a preferred embodiment of the present invention; and Fig. 2 is a block diagram illustrating the related light compensation components in the document camera according to a preferred embodiment of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the so accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
As described in above, when the intensity of the light in the surroundings for a document camera is too high or too low, the effect of projection will become very bad. To solve the above question, the present invention provides a document camera with light compensation functionality, which measures the intensity of the light in the surroundings for the document camera and calculates an optimum intensity of the light, thereby to enhance the effect of projection.
Referring to Fig. 1, which is a schematic diagram illustrating a document camera with light compensation functionality according to a preferred embodiment of the present invention. A document camera 200 is used to capture an image of a document 1 14 through a camera 106. The camera 106 is secured to a base 102 through an arm 104. In addition to the light emitting from a light source 112, the light source 112 is installed on bottom of the camera 106, if the intensity of the light 110 in the surroundings is too high, it will cause the image of to the object presented on the monitor becomes dark so that the image will not to be identified easily. In this embodiment, the intensity of the light 110 in the surroundings is measured through a light sensor 108, wherein the light sensor 108 is installed on top of the camera 106. A signal measured by the light sensor 108 is used to compensate for the light emitting from the light source 1 12.
Fig. 2 is a block diagram illustrating the related light compensation components in the document camera according to a preferred embodiment of the present invention. In order to carry out the above light compensation functionality, the implementation and related components as shown in Fig. 2. The light sensor 108 is used to measure the intensity of the light 1 10 in the surroundings. A signal so converter 109 is connected to the light sensor 108 for converting an analog signal from the light sensor 108 into a digital signal. A light-computing unit 107 is connected to the signal converter 109 for receiving the digital signal from the signal converter 109. The light-computing unit 107 calculates and outputs a signal including an optimum light condition suitable for surroundings, according to as the digital signal. A light controller 105 is connected between the light-computing unit 107 and a light source 112 for receiving the signal including an optimum light condition from the light-computing unit 107. When the light controller 105 receives the signal including the optimum light condition, the light controller 105 controls the intensity of the light of the light source so as to enhance the effect of projection.
In Fig. 2, in addition to the arrangement of the light sensor 108 (installed on top of the camera 106) and the light source 1 12 both must to be fixed in a specific place, the arrangement of the other components may be designed in different places, respectively. For example, the light controller 105, the light-computing lo unit 107 or the signal converter 109 could be made in the form of circuitry on a printed circuit board (PCB), or made in the form of ICs and adhered to a PCB.
The light source 112 of the invention is an emitting-adjustable light source such as a light source having a plurality of light-emitting diodes (LEDs), or at least one emitting-adjustable light bulb. The implement of the light source having a plurality of LEDs includes, for example, controls some of LEDs to be turned on and the others to be turned off, thereby to achieve an object of emitting-adjustable.
According to the preferred embodiment of the present invention, as described in above, the application of the document camera with light compensation functionality of the invention includes measures the intensity of the so light in the surroundings, calculates an optimum intensity of the light and adjusts the intensity of the light of the light source to be outputted. According to the function of light compensation, which can prevent the effect of projection tend to unexpected when the intensity of the light in the surroundings is in a high level, such as the image of the object becomes dark and not easily to be identified, as thereby to further enhance the effect of projection. s
It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.

Claims (4)

  1. Claims 1. A document camera with light compensation functionality,
    comprising: a camera, wherein the camera is secured to a base and said camera has an emitting-adjustable light source; a light sensor, wherein said light sensor is arranged on top of said camera, for receiving a light in the surroundings; a signal converter, wherein said signal converter is connected to said light sensor, for receiving an analog signal from said light sensor and converting the to analog signal into a digital signal; a light-computing unit, wherein said light-computing unit is connected to said signal converter, for receiving the digital signal and calculating a signal including an optimum light condition for the document camera; and a light controller, wherein said light controller is connected to said light-computing unit and said emitting-adjustable light source, for controlling the intensity of the light of said emitting-adjustable light source according to the signal including the optimum light condition.
  2. 2. The document camera of claim 1, wherein said emitting-adjustable light source is a light source having a plurality of light emitting diodes (LEDs).
  3. 3. The document camera of claim 1, wherein said emitting-adjustable light source is an emitting-adjustable light bulb.
  4. 4. A document camera substantially as described herein with reference to and as illustrated in the accompanying drawings. ee e c e ccee aces
    c c e aces cc-e. e e I e I e ce C e e c he
    4. A document camera substantially as described 2s herein with reference to the accompanying diagrams.
    jAmended claims have been filed as follows Claims 1. A document camera with an adjustable light source, comprising: a camera secured to a base, the camera being arranged to capture an image in order directly to present the image on a monitor and having an adjustably emitting light source; a light sensor arranged on top of said camera for detecting light from the surroundings; a signal converter connected to said light sensor, the signal converter being arranged to receive an -' analogue signal from said light sensor and to convert the rem.
    received analogue signal into a digital signal; e..
    a light-computing unit connected to said signal ,. converter, the light-computing unit being arranged to . receive the digital signal and to calculate on the basis of the received digital signal a control signal including an optimum light condition for the document camera; and a light controller connected to said light-computing unit and said adjustably emitting light source, wherein the light controller is arranged to control the intensity of light emitted by the light source according to the control signal.
    2. The document camera of claim 1, wherein the adjustably emitting light source is a light source having a plurality of light emitting diodes (LEDs).
    3. The document camera of claim 1, wherein the adjustably emitting light source is an adjustably emitting light bulb.
GB0510242A 2004-10-18 2005-05-19 Document camera with adjustable light source Expired - Fee Related GB2419251B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW093131597A TWI244575B (en) 2004-10-18 2004-10-18 Document camera with light compensation functionality

Publications (3)

Publication Number Publication Date
GB0510242D0 GB0510242D0 (en) 2005-06-29
GB2419251A true GB2419251A (en) 2006-04-19
GB2419251B GB2419251B (en) 2006-11-29

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ID=34837014

Family Applications (1)

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GB0510242A Expired - Fee Related GB2419251B (en) 2004-10-18 2005-05-19 Document camera with adjustable light source

Country Status (7)

Country Link
US (1) US20060082678A1 (en)
JP (1) JP2006115458A (en)
DE (1) DE102005023401A1 (en)
ES (1) ES2278498A1 (en)
FR (1) FR2876856A1 (en)
GB (1) GB2419251B (en)
TW (1) TWI244575B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5608980B2 (en) * 2009-01-27 2014-10-22 セイコーエプソン株式会社 Document camera and image display system
TWI410737B (en) * 2009-08-25 2013-10-01 Acer Inc Method for compensating light reflection of projection frame and projection apparatus
TW201120560A (en) * 2009-12-11 2011-06-16 Avermedia Information Inc Document camera, apparatus and method for adjusting brightness

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0324422A2 (en) * 1988-01-13 1989-07-19 EASTMAN KODAK COMPANY (a New Jersey corporation) Fill flash control system for cameras
US5012392A (en) * 1989-02-13 1991-04-30 Hochstein Peter A Automatic battery powered video light
JP2002254892A (en) * 2001-03-02 2002-09-11 Matsushita Graphic Communication Systems Inc Electronic blackboard

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0834555B2 (en) * 1988-10-06 1996-03-29 富士写真フイルム株式会社 Electronic camera
JP4288553B2 (en) * 2000-07-25 2009-07-01 富士フイルム株式会社 Camera strobe device
KR100424698B1 (en) * 2002-02-26 2004-03-27 삼성테크윈 주식회사 Line scan camera which compensates ununiformity of intensity of illumination

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0324422A2 (en) * 1988-01-13 1989-07-19 EASTMAN KODAK COMPANY (a New Jersey corporation) Fill flash control system for cameras
US5012392A (en) * 1989-02-13 1991-04-30 Hochstein Peter A Automatic battery powered video light
JP2002254892A (en) * 2001-03-02 2002-09-11 Matsushita Graphic Communication Systems Inc Electronic blackboard

Also Published As

Publication number Publication date
TW200613879A (en) 2006-05-01
JP2006115458A (en) 2006-04-27
GB2419251B (en) 2006-11-29
ES2278498A1 (en) 2007-08-01
TWI244575B (en) 2005-12-01
FR2876856A1 (en) 2006-04-21
DE102005023401A1 (en) 2006-04-27
US20060082678A1 (en) 2006-04-20
GB0510242D0 (en) 2005-06-29

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20090519